Merge dev into main

[timsneath]

@halildurmus Are we ready to review and potentially merge this? There is probably some back and forth between us, but I'd like to move forward if we can!

[halildurmus]

As you mentioned here, we need to decide whether to keep IInspectable in this package or not. I'm inclined towards keeping it here.

If we're gonna keep it here, I'd like to propose some changes to both the IInspectable and IUnknown interfaces.

[timsneath]

As you mentioned here, we need to decide whether to keep IInspectable in this package or not. I'm inclined towards keeping it here.

If we're gonna keep it here, I'd like to propose some changes to both the IInspectable and IUnknown interfaces.

My rationale for including it here is that it's a COM interface that is part of the Win32 metadata (namespace of Windows.Win32.System.WinRT). It's a peer to other Win32 APIs like RoInitialize and WindowsCreateString that sit at the boundary of WinRT. LMK if you have a different principle that you're applying.

[halildurmus]

I removed IInspectable extension methods and added them as top-level functions instead (inspired by How do I access and customize the IInspectable methods of a Windows Runtime class written in C++/WinRT?).

[halildurmus]